| 摘要 |
1,157,874. Laminates. CARBORUNDUM CO. 22 July, 1966 [5 Aug., 1965], No. 33033/66. Heading B5N. [Also in Division C1] Laminated carbon or graphite articles are produced by forming carbon or graphite fibres into a shape comprising layers thereof without using a binder, maintaining the shape at a pressure below atmospheric pressure, pressureimpregnating the shape with a carbonizable binder, curing the shape while under pressure, baking the shape in a non-oxidizing atmosphere and optionally graphitizing the shape at 2500- 2800‹ C. Repetition of the impregnating, curing and baking cycle a number of times with an optional final graphitization yields novel reinforced carbon or graphite articles of density not less than 1À4 g./cc. The fibres used may be in the form of yarn, tape, cloth, felt or wool, and can be stacked into layers or wrapped around mandrels to obtain laminated shapes. The binder may be a liquid polymer of furfuryl alcohol or mixture thereof with furfural, phenolic or ureacondensation products, epoxy resins, dextrose, or coal tar pitch. The curing may be performed at 125‹ C. with a pressure of at least 90 p.s.i. The baking may be performed in a protective atmosphere with gradual heating to 800‹ C. but in the third cycle of a multicycle process a temperature of 1500‹ C. is preferably employed. |
